Writing instrument refill



FIG. 1 is a perspective view showing our new design for a writing instrument refill;

FIG. 2 is a right side elevational view of the writing instrument refill of FIG. 1;

FIG. 3 is a left side elevational view of the writing instrument refill of FIG. 1;

FIG. 4 is a rear view of the writing instrument refill of FIG. 1;

FIG. 5 is a top plan view of the writing instrument refill of FIG. 1; and,

FIG. 6 is a bottom plan view of the writing instrument refill of FIG. 1.

The dashed lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a writing instrument refill, as shown and described. 